So how good of shape was she in when she started? I need to start something and with work travel, the kids activities, etc going to the gym is not realistic at this point in my life. I watched the infomercial last night and it looks hard but would be convenient to do in the garage.
Well she had taken a break for about a month after finishing her third round of P90X, so naturally she packed on several pounds during that time and of course it takes no time to fall out of shape. She, like you, has no time for a gym with our 21 month old daughter so the 35-45 minute workouts are perfect to fit in during afternoon nap time and still be able to accomplish some housework, etc.
The beauty of Insanity is that, unlike P90X, there's no big investment in weights and resistance bands. Pure cardio and using your own body weight for resistance. Therefore, it doesn't take much room to do it.
By no means was she completely out of shape, but she did struggle for the first week getting back into the groove and Insanity is no doubt intense from the warm up onward.